Jesuit theologian, born at Nottelen in Westphalia. He attained fame as a master of casuistry, and out of his lectures to students at Cologne grew his celebrated book Medulla theologiae moralis, facili ac perspicua methodo resolvens casus conscientiae (1645). The manual obtained a wide popularity and passed through over two hundred editions before 1776. Pierre Lacroix added considerably to its bulk, and editions in two folio volumes appeared in both Germany (1710-14) and France (1729). In these sections on murder and especially on regicide were much amplified, and in connection with Robert-François Damiens' attempt on the life of Louis XV the book was severely handled by the parlement of Paris. At Toulouse in 1757, though the offending sections were repudiated by the heads of the Jesuit colleges, the Medulla was publicly burned, and the episode undoubtedly led the way to the duc de Choiseul's attack on the society. Busenbaum also wrote a book on the ascetic life, Lilium inter spinas. He became rector of the Jesuit college at Hildesheim and then at Münster, where he died on the 31st of January 1668, being at the time father-confessor to Bishop Bernard of Galen.